Making method for high-tap-density surface-modified silver powder

A technology of tap density and surface modification, applied in the field of preparation of high tap density surface-modified silver powder, can solve the problems of low tap density and the like

Active Publication Date: 2014-12-10
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally some soft agglomerations between the powder particles of the silver powder prepared by the existing method, so that its tap density is low

Method used

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  • Making method for high-tap-density surface-modified silver powder
  • Making method for high-tap-density surface-modified silver powder
  • Making method for high-tap-density surface-modified silver powder

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preparation example Construction

[0033] The preparation method of the high tap density surface-modified silver powder of one embodiment, comprises the following steps:

[0034] Step S1, preparing silver powder.

[0035] Silver powder can be prepared by methods commonly used in the industry, such as gas phase method, solid phase method and liquid phase method. Preferably, it is prepared by a liquid phase method.

[0036] Preferably, the silver powder is spherical silver. More preferably, the specific surface area of ​​spherical silver is 0.3-0.8m 2 / g.

[0037] In one of the embodiments, the silver powder is prepared by the following steps:

[0038] Step 111, dissolving silver nitrate and surfactant in water to prepare a silver solution, the concentration of silver ions in the silver solution is 50g / L-250g / L.

[0039] Preferably, the surfactant is at least one of gelatin, polyvinyl alcohol, hydroxyethyl cellulose, pectin and polyvinylpyrrolidone.

[0040] Preferably, the mass ratio of silver nitrate to s...

Embodiment 1

[0079] Dissolve 157g silver nitrate and 15g gelatin in 1L deionized water (hereinafter referred to as water), stir and dissolve to obtain a silver solution; dissolve 110g ascorbic acid and 15g gelatin in 1L water, add 5wt% nitric acid solution to adjust the pH value to 2, and obtain Stock solution, control the reaction temperature at (30-35°C), use 5wt% sodium carbonate solution to control the pH value of the reducing solution between 2 and 3, add the silver solution dropwise to the reducing solution within 10 minutes, and stir after adding After 15 minutes, let it stand for precipitation, wash the silver powder with water until the conductivity is less than 50μs / cm, filter it and dry it at 60°C, and sieve it to get silver powder. Put 200 g of zirconium balls with a diameter of 1.5 mm and 0.2 g of oleic acid in a ball mill jar for ball milling for 30 min at a speed of 300 RPM. After the ball milling, put 100g of the above-mentioned silver powder into the ball milling jar, and ...

Embodiment 2

[0082] Dissolve 157g of silver nitrate and 10g of polyvinyl alcohol in 2L of water, stir and dissolve to obtain a silver solution; dissolve 110g of ascorbic acid and 10g of polyvinyl alcohol in 0.4L of water, add 5wt% ammonia solution to adjust the pH to 4, and obtain a reducing solution. Control the reaction temperature at (30-35°C), use 5wt% ammonia solution to control the pH value of the reduction solution between 4 and 5, add the silver solution dropwise to the reduction solution within 120 minutes, and stir for 15 minutes after the addition is complete. Let it stand for precipitation, wash the silver powder with water until the conductivity is less than 50μs / cm, filter and dry at 60°C, and sieve to obtain silver powder. 200 g of zirconium balls with a diameter of 1 mm and 0.1 g of ammonium stearate were placed in a ball mill jar for ball milling for 30 min at a speed of 300 RPM. After the ball milling, put 100g of silver powder into the ball milling pot, and continue the ...

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Abstract

The invention relates to a manufacturing method for high-tap-density surface-modified silver powder. The manufacturing method for the high-tap-density surface-modified silver powder comprises the following steps that zirconium balls and a surface treatment agent are ball-milled, so that a layer of surface treatment agent is evenly attached to the surfaces of the zirconium balls to obtain modified zirconium balls, wherein the surface treatment agent is selected from at least one of ammonium stearate, oleic acid and palmitic acid; after the modified zirconium balls and silver powder are ball-milled for 20-120 minutes, the high-tap-density surface-modified silver powder is obtained. The high-tap-density surface-modified silver powder manufactured through the manufacturing method is high in tap density.

Description

technical field [0001] The invention relates to a method for preparing surface-modified silver powder with high tap density. Background technique [0002] Silver powder is one of the most widely used precious metal powders in the electronics industry. It is used to make conductive adhesives, conductive coatings and various electronic pastes. The morphology, particle size, uniformity, dispersibility and tap density of silver powder all affect the film-forming performance of silver paste made of silver powder. [0003] The current preparation methods of silver powder include gas-phase method, solid-phase method and liquid-phase method. The gas-phase method has large investment, high energy consumption, and low yield; the silver powder prepared by the solid-phase method has a relatively large particle size; the liquid-phase method is relatively simple, and is currently a common method for preparing silver powder at low cost. However, the powder particles of the silver powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F9/24
Inventor 彭建雄吴海斌唐浩杨超勤孔祥冬
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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